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Mr. Terry Lau -3- 29 June 1995 detection limit of 10 µg/1 for total lead using USEPA Method 239.1. VOCs should be analyzed by either USEPA Method 601/602 or 8260. Enclosure 4, which compares the detection limits of these methods for VOCs which have been found at landfills, shows that Method 624 provides the highest detection limits. Regarding PCBs, the Board's contract labs can achieve detection limits of 0.2 to 5.0 µg/l. Your lab should attempt to attain the 0.2 µg/1 detection limit since the USEPA's MCL of 0.5 µg/1 would likely be the water quality goal for PCBs. 9. Section 5 of the work plan describes the importance of a quality assurance/quality control program but does not specify the procedures to ensure collection of quality data. The work plan also states that the laboratory will perform tests on method blanks, surrogate spikes, matrix spikes, and duplicate spikes to ensure the quality of analytical activities but does not specify when these analyses will be conducted. 10. Table 4 on Page 7-1 shows a Board review start date of 19 May 1995. I received the report only on 7 June 1995. Nonetheless, I will meet the review completion date of 18 July 1995. Table 7-1 also shows no time allotment for Board review of the Final RI report. By 14 July 1995, please address the DTSC's and Board's comments. If you have any questions, you may call me at(916) 255-3049. PHILIVS. ISORENA Associate Engineer PSI:psi\lsb cc: Ms. Hortensia Muniz, Department of Toxic Substances Control, Sacramento Ms. Diane Hinson, San Joaquin Public Health Services, Stockton Ms. Lang Huey, Department of the Navy, Western Division, San Bruno Ms. Kristy Spake, Department of the Navy, Western Division, San Bruno Mr. Brad Beeman, Naval Communication Station, Stockton Mr. Gregory J. Reller, PRC Environmental Management, Incorporated, Rancho Cordova Mr. William A. Spong, ERM-West, Inc., Sacramento